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Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName T. Rowe Price Retirement Funds, Inc.
Prospectus Date rr_ProspectusDate Oct. 01, 2012
Investor Class | T. Rowe Price Retirement Income Fund
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading SUMMARY

T. Rowe Price Retirement Income Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The fund seeks the highest total return over time consistent with an emphasis on both capital growth and income.
Expense [Heading] rr_ExpenseHeading Fees and Expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock This table describes the fees and expenses that you may pay if you buy and hold shares of the fund.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Fees and Expenses of the Fund

Shareholder fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption
Annual fund operating expenses
(expenses that you pay each year as a
percentage of the value of your investment)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock The fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the fund’s performance. During the most recent fiscal year, the fund’s portfolio turnover rate was 20.7% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 20.70%
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This example is intended to help you compare the cost of investing in the fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the fund for the time periods indicated and then redeem all of your shares at the end of those periods. The example also assumes that your investment has a 5% return each year and that the fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading Investments, Risks, and Performance

Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock The fund pursues its objective by investing in a diversified portfolio of other T. Rowe Price stock and bond funds that represent various asset classes and sectors. The fund is intended for retired investors who seek income and relative stability from bonds along with some capital appreciation potential from stocks. The fund’s “neutral allocations,” which are what T. Rowe Price considers broadly appropriate for investors during their retirement years, are 40% stock funds and 60% bond funds.

These allocations are intended to reflect the need for reduced market risks, lower portfolio volatility, and an income stream throughout retirement. Although the fund is designed for investors already in retirement, you should be aware that it does not decrease its equity holdings and become increasingly conservative over time. As such, you may want to consider a more conservative or more aggressive approach depending on your age and specific stage of retirement. The fund is designed to be part of an investor’s overall retirement strategy, but is not intended as a complete solution to an investor’s retirement needs. While the overall asset mix generally remains consistent over time, tactical decisions may be made by T. Rowe Price to overweight or underweight a particular asset class or sector based on its market outlook. The target allocations assigned to the broad asset classes (Stocks and Bonds), which reflect these strategic decisions resulting from market outlook, are not expected to vary from the neutral allocations by more than plus (+) or minus (-) five percentage (5%) points.

The following table details the way the portfolio is generally expected to be allocated between the asset classes. The table also shows the sectors within those broad asset classes to which the portfolio will have exposure, and the expected allocations to the T. Rowe Price funds that will be used to represent those sectors. The information in the table represents the fund’s neutral allocations. The target allocations and actual allocations may differ. The fund’s shareholder reports set forth its actual allocations between stock funds and bond funds and to the individual T. Rowe Price funds.

Income Fund

Asset Class

Sector

Fund

Neutral Allocation

Stocks

40.00%

Domestic Large-Cap Stocks

Equity Index 500
Growth Stock
Value

20.47%
0.00
0.00

Domestic Mid-Cap Stocks

Mid-Cap Growth
Mid-Cap Value

1.60
1.60

Domestic Small-Cap Stocks

New Horizons
Small-Cap Stock
Small-Cap Value

0.98
0.97
0.98

International Developed Market Stocks

International Growth & Income
International Stock
Overseas Stock

3.23
3.23
3.23

International Emerging Market Stocks

Emerging Markets Stock

1.71

Inflation Focused Stocks

Real Assets

2.00

Bonds

60.00

Domestic Investment-Grade Bonds

New Income

21.00

Domestic High Yield Bonds

High Yield

3.00

International Bonds

Emerging Markets Bond
International Bond

3.00
3.00

Inflation Focused Bonds

Inflation Focused Bond

30.00
Risk [Heading] rr_RiskHeading Principal Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock As with any mutual fund, there is no guarantee that the fund will achieve its objective. The fund’s share price fluctuates, which means you could lose money by investing in the fund. There is no guarantee that the fund will provide adequate income at and through your retirement. The principal risks of investing in this fund are summarized as follows:

Asset allocation risk The fund’s risks will directly correspond to the risks of the underlying funds in which it invests. By investing in many underlying funds, the fund has partial exposure to the risks of many different areas of the market. However, the selection of the underlying funds and the allocation of the fund’s assets among the various asset classes and market sectors could cause the fund to underperform other funds with a similar investment objective.

General equity risk Stocks generally fluctuate in value more than bonds and may decline significantly over short periods. As with any fund having equity exposure, the fund’s share price can fall because of overall weakness in the stock market. The value of a stock fund in which the fund invests may decline due to general market conditions or because of factors that affect a particular industry or market sector.

Small- and mid-cap stock risk Investing in small- and mid-cap funds entails greater risk than investing in funds that focus on larger companies. Stocks of smaller companies are usually more volatile than stocks of larger companies because smaller companies usually have more limited financial resources, less experienced management, and less publicly available information, and seldom pay significant dividends that could help to cushion returns in a falling market.

Investment style risk Because the fund invests in stock funds with both growth and value characteristics, its share price may be negatively affected if either investing approach falls out of favor. Growth stocks tend to be more volatile than certain other types of stocks and are more sensitive to changes in current or expected earnings. Value stocks carry the risk that investors will not recognize their intrinsic value for a long time or that they are actually appropriately priced at a low level.

Interest rate risk This is the risk that a rise in interest rates could cause the price of a bond fund in which the fund invests to fall. Generally, the longer the weighted average maturity of an underlying fund, the greater its interest rate risk.

Credit risk This is the risk that an issuer of a debt security held by an underlying bond fund could be downgraded or default, thereby negatively affecting the fund’s price or yield.

Liquidity risk This is the risk that a fund may not be able to sell a holding in a timely manner at a desired price. This risk could affect both stock and bond funds in which the fund invests.

Foreign investing risk This is the risk that the fund’s investments in international funds may be adversely affected by economic conditions or developments overseas, or decreases in foreign currency values relative to the U.S. dollar. The risks are heightened for underlying funds that focus on emerging markets.
Risk Lose Money [Text] rr_RiskLoseMoney The fund’s share price fluctuates, which means you could lose money by investing in the fund.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock The bar chart showing calendar year returns and the average annual total returns table indicate risk by illustrating how much returns can differ from one year to the next and how fund performance compares with that of a comparable market index. The fund’s past performance (before and after taxes) is not necessarily an indication of future performance.

The fund can also experience short-term performance swings, as shown by the best and worst calendar quarter returns during the years depicted.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart showing calendar year returns and the average annual total returns table indicate risk by illustrating how much returns can differ from one year to the next and how fund performance compares with that of a comparable market index.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 1-800-225-5132
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress troweprice.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The fund’s past performance (before and after taxes) is not necessarily an indication of future performance.
Bar Chart [Heading] rr_BarChartHeading
Retirement Income Fund
Calendar Year Returns
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Quarter
Ended		Total
Return
Best Quarter     6/30/09    11.53%
Worst Quarter     12/31/08   -10.00%

The fund’s return for the six months ended 6/30/12 was 4.67%.
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns
Periods ended
December 31, 2011
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged Effective November 1, 2012, the S&P Target Date Retirement Income Index will replace the Dow Jones Moderately Conservative Portfolio Index as the fund's primary benchmark. The S&P Target Date Retirement Income Index is more representative of the fund's investment program and asset allocation strategies.
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred After-tax returns shown are not relevant to investors who hold their fund shares through tax-deferred arrangements, such as a 401(k) account or individual retirement account.
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock In addition, the average annual total returns table shows hypothetical after-tax returns to suggest how taxes paid by a shareholder may influence returns. After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their fund shares through tax-deferred arrangements, such as a 401(k) account or individual retirement account.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock Updated performance information is available through troweprice.com or may be obtained by calling 1-800-225-5132.
Investor Class | T. Rowe Price Retirement Income Fund | T. Rowe Price Retirement Income Fund
  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none [1]
Maximum deferred sales charge (load) rr_MaximumDeferredSalesChargeOverOther none [1]
Redemption fee rr_RedemptionFeeOverRedemption none [1]
Maximum account fee rr_MaximumAccountFee 20 [1],[2]
Management fees rr_ManagementFeesOverAssets none [1]
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none [1]
Other expenses rr_OtherExpensesOverAssets none [1]
Acquired fund fees and expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.57% [1]
Total annual fund operating expenses rr_ExpensesOverAssets 0.57% [1]
1 year rr_ExpenseExampleYear01 58
3 years rr_ExpenseExampleYear03 183
5 years rr_ExpenseExampleYear05 318
10 years rr_ExpenseExampleYear10 714
2003 rr_AnnualReturn2003 16.25%
2004 rr_AnnualReturn2004 7.66%
2005 rr_AnnualReturn2005 4.87%
2006 rr_AnnualReturn2006 9.98%
2007 rr_AnnualReturn2007 6.09%
2008 rr_AnnualReturn2008 (18.39%)
2009 rr_AnnualReturn2009 22.07%
2010 rr_AnnualReturn2010 10.10%
2011 rr_AnnualReturn2011 1.43%
Year to Date Return, Label rr_YearToDateReturnLabel The fund’s return for the six months ended
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Jun. 30, 2012
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 4.67%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 11.53%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (10.00%)
1 Year rr_AverageAnnualReturnYear01 1.43%
5 Years rr_AverageAnnualReturnYear05 3.37%
Since inception rr_AverageAnnualReturnSinceInception 6.44%
Inception date rr_AverageAnnualReturnInceptionDate Sep. 30, 2002
Investor Class | T. Rowe Price Retirement Income Fund | Returns after taxes on distributions | T. Rowe Price Retirement Income Fund
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 0.65%
5 Years rr_AverageAnnualReturnYear05 2.28%
Since inception rr_AverageAnnualReturnSinceInception 5.35%
Inception date rr_AverageAnnualReturnInceptionDate Sep. 30, 2002
Investor Class | T. Rowe Price Retirement Income Fund | Returns after taxes on distributions and sale of fund shares | T. Rowe Price Retirement Income Fund
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 1.09%
5 Years rr_AverageAnnualReturnYear05 2.30%
Since inception rr_AverageAnnualReturnSinceInception 5.01%
Inception date rr_AverageAnnualReturnInceptionDate Sep. 30, 2002
Investor Class | T. Rowe Price Retirement Income Fund | Dow Jones Moderately Conservative Portfolio Index (reflects no deduction for fees, expenses, or taxes)
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 2.82% [3]
5 Years rr_AverageAnnualReturnYear05 4.06% [3]
Since inception rr_AverageAnnualReturnSinceInception 7.29% [3]
Investor Class | T. Rowe Price Retirement Income Fund | Combined Index Portfolio (reflects no deduction for fees, expenses, or taxes)
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 1.81% [4]
5 Years rr_AverageAnnualReturnYear05 2.57% [4]
Since inception rr_AverageAnnualReturnSinceInception 5.57% [4]
[1] While the fund itself charges no management fee, it will indirectly bear its pro-rata share of the expenses of the underlying T. Rowe Price funds in which it invests (acquired funds). The acquired funds are expected to bear the operating expenses of the fund.
[2] Subject to certain exceptions, accounts with a balance of less than $10,000 are charged an annual $20 fee.
[3] Effective November 1, 2012, the S&P Target Date Retirement Income Index will replace the Dow Jones Moderately Conservative Portfolio Index as the fund's primary benchmark. The S&P Target Date Retirement Income Index is more representative of the fund's investment program and asset allocation strategies.
[4] Combined Index Portfolio is an unmanaged portfolio composed of 40.00% stocks (28.60% Russell 3000 Index, 11.40% MSCI All Country World Index ex USA), and 60.00% bonds (30.00% Barclays U.S. Aggregate Bond Index, 30.00% Barclays U.S. 1-5 Year Treasury TIPS Index). The percentages will vary over time and the indices may vary over time.